\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}
*No=No
*no=no
*no!=No
*No!=no
*NO=No
*NO+NO=noNo*NOno+no*
\end{equation*}
\end{document}
